OH CRAP! You've lost you're keys on your hike (to the snack store). Good thing you planned ahead and left yourself a way to get back into your house. Now introducing the Sewer Key Holder. Saving thousands from sleeping in the cold! (Don't fact check that) Just don't tell your in-laws about it or you will have a bad time.

It prints flat on the bed and all you need to do is glue 8mm x 2mm magnets inside and you're set!